陶瓷微滤膜净化200溶剂油的研究

ABSTRACTABSTRACTCeramic microfiltration membranes was used to microfiltrate impure solvent naphtha200 coming from aluminum pigment industry,and the effect of operating parameter,concentration experiment,membrane fouling mechanism,membrane flux recovery andthe industrial design were investigated respectively.This work contributed todevelopment of ceramic microfiltration membrane technology in the application ofimpure solvent naphtha.The microfiltration processes of solvent naphtha containing impurities were studiedwith 0.2 um,0.5 and 0.8 um ceramic membranes.As for 0.2 um,two feeds were selected,one was the solvent naphtha without water,the other was the solvent naphtha with 0.5%(@)water.The effects of operating time,trans-membrane pressure,cross-flow velocity,temperature and aluminum powder content on permeate flux and/or rejection wereinvestigated,respectively.The results show that,permeate flux of the solvent naphthawithout water was much higher than that of the solvent naphtha with 0.5%(@)water.Withincreasing operating time,permeate flux decreased gradually to a steady value,and therejection of aluminum powder increased rapidly to 100%.Steady-state flux enhanced withincreasing trans-membrane pressure or temperature,and reached to a maximum valuewith the increase of cross-flow velocity.The higher the content of aluminum powder was,the higher the permeate flux was.Optimum operating parameters were trans-membranepressure 0.16 MPa,cross-flow velocity 3.9 m/s and temperature 40 C.The similar resultswere obtained for 0.5 um and 0.8 um,the optimum trans-membrane pressures were 0.12and 0.10 MPa respectively.In concentration experiments,with increasing volumeconcentration factor,permeate flux decreased more rapidly,then slowly,and finallyrapidly again;rejection of aluminum powder was increased rapidly to 100%,andrejections of isostearic acid and linoleic acid were increased slightly,and purified solventnaphtha was transparent.The scanning electron microscope and energy dispersive spectrometer (SEM-EDS)were done.It indicates that the fouling on the membrane surface was an integrated effectof aluminum particles and organic matters,and it almost took place on the membranesurface.Further,various membrane resistances were calculated,the membrane foulingresistance (Rr)played an important role in flux decline.In the process of chemicalV